Partition-forming assemblies and components thereof



5 June 21, 1966 H. s. DUDOFF 3,

PARTITION-FORMING ASSEMBLIES AND COMPONENTS THEREOF Filed Jan. 19, 1961 INVENTOR f/Mow 9, Dub OFF F /G. 2

BY ATTORNEYS United States Patent 3,256,659 PARTITION-FORMING ASSEMBLIES AND COMPONENTS THEREOF Harold S. Dudolf, 552-556 NW. 5th St., Miami, Fla. Filed Jan. 19, 1961, Ser. No. 83,739 6 Claims. (Cl. 52-298) This invention relates to assemblies which are particularly useful in the formation of partitions, and to components of such assemblies.

Various types of partition-forming components and/ or assemblies have been heretofore suggested for use in separating different areas into rooms (wall partitions), for partially separating a room into joining sections (room dividers), and for defining business areas on opposite sides of a desk (counter-top partitions). The latter two types of partitions are generally formed by a plurality of panels in position between partition posts, and

v the present invention relates particularly to partitions formed in this manner.

Usually, when partitions are formed by using a plurality of panels, and a plurality of partition posts to secure the panels in place, some base member is provided for supporting the bottom of each post, and the post is either formed with an integral cap, or some decorative cap is provided for attachment therewith. To ensure proper support in the structures heretofore available, the base members were provided with laterally-projecting base flanges, or similar attaching components, whereby screws could be passed through the flange or other Component and into the surface to which the base members, and thereby the posts, were to be attached.

As will be appreciated by those of ordinary skill in the art, each of the posts, if hollow and formed as an extrusion, takes a different shape depending on the location in which it is used. For example, the posts used at the end of a partition are extruded with a recess defined by an inwardly-extending outwardly-opening channel in one face thereof adapted to receive the ends of a panel, the posts used between partitions extending in end-toend alignment are provided with two recesses defined by such channels in opposed faces thereof, and the posts used at corners of the partition where the panels coupled with the post extend at right angles to one another are provided with recesses defined by such channels in adjacent faces thereof extending at right angles to one another. If the posts are extruded, as suggested, then the same are hollow, and the configuration of the interior of each post, as well as the exterior configuration, depends on the location at which it is to be placed.

Thus, when the prior art constructions were used, separate base members having particular configurations were provided for each different type of post. Moreover, as suggested above, such base members had laterally-projecting flanges through which screws were passed for attaching the base member to the support surface, and in addition set screws were incorporated at the bottom of the posts for locking the posts on the base members. A separate cap was provided for each type post member because of the differing internal configurations of each type post, and in order to secure the caps in place set screws were threaded in the top of each post. Accordingly, the prior art presented three primary problems: (1) The problem of separating the right base members and right cap members for the particular type of post being used at a given location; (2) the problem of providing set screws in some inexpensive manner so that such screws did not detract from the appearance of the post; and (3) the problem of providing an attractive base flange and screws therefor. The latter two of these problems are without solution as long as set screws and base flanges are used, because set screws are inherently unattractive if 'efllcient, and base flange screws are not only inherently unattractive, but serve as dirt collectors.

The present invention has as its primary object the provision of a new type partition assembly which is not subject to any of the foregoing problems. More specifically, a primary object of the present invention is to provide a partition assembly incorporating 1) a base member which can be used with any of the diiferent types of posts required at different locations, (2) a cap member which can be used with any of the different types of posts provided at different locations, (3) a post construction which does not have at its base any laterallyprojecting flange, or similar attaching means, with screws passing therethrough which are visible once the construction is in place, and (4) a post construction free of set screws.

Still further, more specific, and yet important, objects of the present invention are: (a) to provide an assembly for vertically supporting a plurality of panels with respect to a horizontal surface, which assembly conforms with the preceding objects, and provides for the utilization of extruded lengths having dilfering internal and external contours depending on the location at which the length is to be used; (b) to provide such an assembly. which incorporates base members which can be readily and easily attached to any surface whether wood, marble, or vitreous material, and in addition which incorporates base members that are completely invisible to the viewer once the assembly is in place; (c) to provide an assembly conforming with all of the preceding objects wherein the base members can be used with any of the extrusion lengths required regardless of the interior.

or exterior configuration thereof; (d) to provide such an assembly including cap members which serve to decorate the tops of any of the extruded lengths and which can be used interchangeably with any of the extruded lengths regardless of their internal configuration; and (e) to provide an assembly confirming with each and every one of the preceding objects and incorporating base members which can be easily and inexpensively manufactured, cap members which can be easily and inexpensively manufactured, and extrusion lengths which can be easily and inexpensively manufactured.

The invention lies in the construction, and combination of the various components of the assembly and will be more readily understood after reading the following detailed description of the illustrative and preferred embodiments of the invention. Such embodiments are presented in the annexed drawings, wherein:

FIGURE 1 is a fragmental perspective view showing a counter having vertically-supported thereon a partition assembly constructed in accordance with the present invention;

FIGURE 2 is an exploded view of the corner post and cooperating components shown in the assembly of FIG- URE 1; i

FIGURE 3 is a side view of a base member constructed in accordance with the present invention;

FIGURE 4 is a plan view of the base member shown in FIGURE 3, FIGURE 4 having been taken on the line 44 of FIGURE 3 and showing the bottom of the base member;

FIGURE 5 is a plan view of the top of the base member shown in FIGURE 3, FIGURE 5 having been taken on the line 55 of FIGURE 3 and showing the top of such base member;

FIGURE 6 is a side view of a cap or closure member provided by the present invention;

FIGURE 7 is a plan view taken on the line 7-7 of FIGURE 6 showing the closure member as the same would appear from the bottom thereof;

FIGURE 8 is a cross-sectional view of an end post and base member provided by the present invention and showing the manner in which the two components cooperate;

FIGURE 9 is a cross-sectional view similar to FIGURE 8, FIGURE 9 presenting the manner in which an intermediate post cooperates with the base member in accordance with the present invention.

In FIGURE 1, the overall assembly shown is generally designated by the numeral 2. Such assembly includes an end post 4, a corner post 6, and an intermediate post 8, which serve to support the panels 10, 1 2, and 14 vertically with respect to a counter 16. Each of the posts 4, 6 and 8 are provided with a cap member 18, which, as explained in more detail hereinbelow, is of the same con struction for each of the posts.

All of the posts are hollow extrusions, the post 6 appearing in perspective as shown in FIGURE 2, and the posts 4 and 8 appearing in cross-section as shown in FIG- URES 8 and 9, respectively. As known to those of ordinary skill in the art, aluminum extrusions taking the shape shown may be provided in any desired length and cut to the desired size, as needed. The configuration of the particular extrusion mounted at a given spot on a counter, or other supporting surface, depends upon the manner in which the same is to be utilized for support of a panel.

The post 4 which serves as an end post only supports one edge of a panel, such as that designated by numeral 10. Accordingly, the end post 4 or other end posts utilized according to the present invention have one outwardlyopening panel-receiving longitudinal recess thereon, such as that designated by the numeral (FIGURE 8). This recess is defined by an inwardly-extending channel on one side wall, namely, wall 32, of the post 4. The recess 20 is spaced a predetermined distance, designated in the drawing by the letter d, from one longitudinal edge of the side wall 32.

The post 8 which serves as an intermediate post as shown, and other intermediate posts used in the invention assembly, have two outwardly-opening panel-receiving longitudinal recesses 22 and 24 which are defined by aligned inwardly-extending channels 34 and 36 on the opposed side walls 38 and 40' of the post. The panelreceiving recesses 22 and 24 are spaced from the longitudinal edges of the side walls 38 and 40 by at least substantially the same predetermined distance d, referred to in connection with the post 4.

The corner post 6 supports panels at right angles to one another, and thus this post, and other corner posts used in the assembly of the invention, are provided with two outwardly-opening panel-receiving longitudinal recesses 42 and 44 defined by two inwardly-extending channels 46 and 48 in the adjacent side walls 50 and 52 of the post. The panel-receiving recesses 42 and 44 are spaced from the remote longitudinal edges 54 and 56 of the adjacent side walls 50 and 52 by the same predetermined distance d as that referred to with respect to the post 4 and shown in FIGURE 8, and with respect to the post 8 and shown in FIGURE 9.

All of the posts 4, 6 and 8, as suggested above, are

- similarly, are defined by four sidewalls, two of which have indentations therein, and the corner posts are defined by four side walls, two of which in adjacent relationship have indentations therein. In accordance with the present invention, all of the posts are square, or at least substantially square, in cross-section.

In order to support all of the posts in the desired position, a base member such as that designated by the numeral 60 is provided. Each of the base members is adapted to be fixed to a horizontal surface to support a post vertically with respect there-to. For this purpose, bores 62 and 64 extend through the body of the base member, and screws such as those designated by the numeral 66 are passed through the bores and tightened into the surface on which the base member is to be attached.

As pointed out at the outset of this specification, one of the features of the present invention is to provide a single type of base member which can be used with all of the posts, regardless of their external or internal configuration, i.e., regardless of whether or not they are a corner post, an end post, or an intermediate post. Accordingly, each of the base members comprises a support block dimensioned to frictionally engage the inside of any of the posts. Each base member has two pairs of opposed side walls. The walls of the first pair of opposed 'side walls are designated in the drawings by the numerals 68 and 70, and the second pair of walls consists of those designated by the numerals 72 and 74. As shown in FIGURE 3, the side walls of each pair gradually taper outwardly with respect to one another from the top end 76 of the support block or base member 60 toward the bottom end 78 thereof. The base members are preferably precision die-castings having an angle of taper A which is but a few degrees.

As shown in FIGURES 4 and 5 one pair of side walls of each base member, namely walls 68 and 70, have oppositely opening channel recesses 80 and 82 therein. These channel recesses are adapted to receive the channels 44, or 45, or 30, or 34, or 36, depending on the post to be supported. The recesses 80 and 82 extend for the length of the support block.

One side wall of the other pair of side walls of the base member, namely wall 74, is provided with a channel recess 84 therein adapted to receive any channel of the posts just-as the recesses 80 and 82 are adapted to receive the channels of the posts. The recess 84 extends for the length of the support block also. The recesses in the one pair of side walls 68 and 70 are spaced from the other side wall 72 of the other pair of side walls referred to above, by a predetermined distance d, and the recess 84 in the side wall 74 is spaced by substantially the same predetermined distance d from one of the side walls 68 or 70 (the side wall 68, as presented in the drawings).

The base member 60 is positioned as shown in FIG- URE 2 for securing a corner post in place, and is positioned as shown in FIGURE 8 for securing an end post in place, and is positioned as shown in FIGURE 9 for securing an intermediate post in place. When positioned as shown in FIGURE 2, the recess 80 does not cooperate with a channel on the post, and is merely unfilled. Similarly, when positioned to support the corner post 4, the recesses 80 and 84 are unfilled, and when positioned to support the intermediate post as shown in FIGURE 9, the recess 84 remains unfilled.

Since the posts are all generally square in cross-section, since the side walls of all of the posts are the same, since the channels in each of the posts are positioned at least substantially an equal distance from one longitudinal edge posed side wall. The bottom of each of the base members has a size whereby it tightly frictionally receives any of the posts, and the top of each of the base members allows the post to slip easily thereover. Accordingly, once the base members are secured in place by means of the screws 66, the posts are placed over the base member, and then forced down on the base member under pressure. In this manner, the posts are frictionally and tightly supported in a given position, and there is no need for using set screws to hold the posts in place on the base members. Moreover, the base members fit entirely within the posts,

and thus the screws holding the base members in place are not visible, and in fact the base members are not visible once a post has been secured thereon.

The cap members which have been designated by the numeral 18 (FIGURES l, 6 and 7) comprise a crown portion 92 which is preferably at least some-what decorative. As shown, the crown portion comprises an equilateral pyramid. Depending from the crown portion of each of the cap members 90 is a connecting member 94. This connecting member has the same cross-sectional configuration, as the base member 60. However, it is only about one-third or one-fourth as deep as the base member, preferably, and the opposed walls of the connecting member taper inwardly with respect to one another from their connection with the crown portion 92. The angle of taper of the side walls of the connecting member 94 is substantially the same as the angle of taper of the side walls of the base member. The cap member has three recesses 80, 82 and 84, which are positioned in exactly the same manner as the recesses 80, 82 and 84 of the base member, and for this reason repetition of such positioning is believed unnecessary. The cap members, like the base members, can be used with any of the posts by virtue of the recessed construction described in detail hereinabove.

The cap members, in accordance with the preferred embodiment of the invention, incorporate a crown portion 92 with a flanged edge 96 that projects over the ends of any of the posts when the caps are applied thereto. In this manner, the raw edge of any of the posts caused by sawing the same to the desired length, is covered.

One of the important aspects of the present invention not discussed in detail hereinabove, is the provision of a base member which has a depth between one and two times its width in any direction. Preferably, the depth of the base member is approximately two times its width. With this construction, the base member is of such height and shape as to anchor any given post securely in place, and at the same time, each base member is short enough so as to eliminate any fulcrum activity. More specifically, the. base member is sufficiently short to prevent any rocking about its attachment with the supporting surface, and any rocking of a post about the base member itself.

.After considering the foregoing detailed description of the preferred embodiments of the invention, it should be apparent that the invention provides both a cap and base member which are devised so as to be used interchangeably with either an intermediate post, an end post, or a corner post, and a cap member and base member which are so designed as to not require, either at the top of any post, or at the bottom of any post, any set screws. Thus, the finished construction, when provided with panels in place as shown in FIGURE 1, does not incorporate any unsightly screws which are visible. Moreover, as. ex-

plained, with the construction provided, the posts are maintained securely in place, and no flanges are existent at the base of the posts. The base member 60 and cap coupling 94 are tapered whereby they broaden at bottom of base member and top of cap coupling member, respectively, to provide a press fit securely anchoring post to base member and cap to post with no unsightly set screws showing.

Although no particular mention has been made hereinabove of the particular materials to be used, preferably the posts are formed of extruded aluminum which is either satin-finished, provided with an anodized brass finish, or provided with a lacquer finish. The base members are preferably-made of lead alloy or some other suitable precision die-casting material, and the cap members are made of a similar material, but in addition are chrome or nickel-plated so as to prevent tarnish and appear attractive.

The recesses and channels provided on each of the posts are preferably of the order of inch in width of opening, so as to accommodate A-inch or 'V -inch thick panels. Moreover, although all of the recesses can take particular configurations as desired, preferred embodiments of the invention provide for making all of the chan-. nels right-angle channels, i.e., making each of the channels so that it has a base wall with side walls projecting upwardly from either side of the base wall at right angles thereto.

While the invention has been described in some detail hereinabove in connection with the preferred and illustrative embodiments thereof presented in the annexed drawings, certain modifications of the invention may b come readily apparent to those of ordinary skill in the art after reading the foregoing description.

Accordingly,

What is claimed is:

1. In an assembly for vertically supporting a plurality of panels with respect to a horizontal surface, said assembly comprising a plurality of generally square at least substantially equally-dimensioned open-ended elongated hollow'posts, at least one of said posts having an outwardly-opening panel-receiving longitudinal recess there on defined by an inwardly-extending channel on one side wall thereof and spaced a predetermined distance from one longitudinal edge of the said one wall; at least one of said posts having two outwardly-opening panel-receiving longitudinal recesses thereon defined by aligned inwardly-extending channels on opposed side walls thereof and spaced from the longitudinal edges of the said opposed side walls by at least substantially said predetermined distance, and at least one of said posts having two outwardly-opening panel-receiving longitudinal recesses thereon defined by two inwardly-extending channels in adjacent side walls thereof extending at right angles to one another and spaced from the remote longitudinal edges of the said adjacent side walls by at least substantially said predetermined distance; said recesses on said posts extending intermediate said longitudinal edges, said predetermined distance being less than the distance between said channel and the other longitudinal edge of [the side wall on which the channel is disposed; the improvement comprising a plurality of base members adapted to be fixed to the horizontal surface to support said posts in spaced-apart relation for receiving the ends of the panels, each of said base members comprising a support block dimensioned to frictionally engage the inside of said posts and having two pairs of opposed side walls, the side walls of each pair gradually diverging outwardly with respect to one another from the top end of said support block toward the bottom end thereof, one pair of said side walls having aligned oppositely-opening channel recesses therein adapted to receive said channels and extending for the lengths thereof, one side wall of the other pair having a channel recess therein adapted to receive said channels and extending for the length thereof, said recesses in said one pair of side walls being spaced from the other side wall of said other pair by a given distance, said recess in said one side wall of said other pair of side walls being spaced by at least substantially said given distance from one of said side walls of said one pair whereby one end of each of said posts fits over one of said base members.

2. In an assembly for vertically supporting a plurality of panels with respect to a horizontal surface, said assembly comprising a plurality of generally square at least substantially equally-dimensioned open-ended hollow posts, at least one of said posts having two outwardlyopening panel-receiving longitudinal recesses thereon defined by aligned inwardly-extending channels on opposed side walls thereof and spaced from the longitudinal edges of the said opposed side walls by a predetermined distance, and at least one of said posts having two outwardlyopening panel-receiving longitudinal recesses thereon defined by two inwardly-extending channels in adjacent side walls thereof extending at right angles to one another and spaced from the remote longitudinal edges of the said adjacent side walls by at least substantially said predetermined distance; the improvement comprising a plurality of base members adapted to he fixed to the horizontal surface to support said posts in spaced-apart relation for receiving the ends of the panels, each of said base members comprising a support block dimensioned to frictionally engage the inside of said posts and having two pairs of opposed side walls, the side walls of each pair gradually diverging outwardly with respect to one another from the top end of said support block toward the bottom end thereof, one pair of said side walls having aligned oppositely-opening channel recesses therein adapted to receive said channels and extending for the lengths thereof, one side wall of the other pair having a channel recess therein adapted to receive said channels and extending for the length thereof, said recesses in said one pair of side walls being spaced from the other side wall of said other pair by a given distance, said recess in said one side wall of said other pair of side walls being spaced by at least substantially said given distance from one of said side walls of said one pair; whereby one end of each of said posts fits over one of said base members.

3. In an assembly for vertically supporting a plurality of panels with respect to a horizontal surface, said assembly comprising a plurality of generally square at least substantially equally-dimensioned open-ended hollow posts, at least one of said posts having one outwardlyopening panel-receiving longitudinal recess thereon defined by an inwardly-extending channel on one side wall thereof and spaced a predetermined distance from one longitudinal edge of the said :one side wall and at least one of said posts having two outwardly-opening panel-receiving longitudinal recesses thereon defined by aligned inwardly-extending channels on opposed side walls there-of and spaced from the longitudinal edges of the said opposed side walls by at least substantially said predetermined distance; the improvement comprising a plurality of base members adapted to be fixed to the horizontal surface to support said posts in spaced-apart relation for receiving the ends of the panels, each of said base members comprising a support block dimensioned to frictionally engage the inside of said posts and having two pairs of opposed side walls, the side walls of each pair gradually diverging outwardly with respect to one another from the top end of said support block toward the bottom end thereof, one pair of said side walls having aligned oppositely-opening channel recesses therein adapted to receive said channels and extending for the lengths thereof, one side wall of the other pair having a channel recess therein adapted to receive said channels and extending for the length thereof, said recesses in said one pair of side walls being spaced from the other side wall of said other pair by a given distance, said recess in said one side wall of said other pair of side walls being spaced by at 8 least substantially said given distance from one of said side walls of said one pair; whereby one end of each of said posts fits over one of said base member.

4. In an assembly for vertically supporting a plurality of panels with respect to a horizontal surface, said assembly comprising a plurality of generally square at least substantially equally-dimensioned open-ended hollow posts, at least one of said posts having one outwardlyopening panel-receiving longitudinal recess thereon defined by an inwardly-extending channel on one side wall thereof and spaced a predetermined distance from one longitudinal edge of the said one side wall; and at least one of said posts having two outwardly-opening panelreceiving longitudinal recesses thereon defined by two inwardly-extending channels in adjacent side walls thereof extending at right angles to one another and spaced from the remote longitudinal edges of the said adjacent side walls by at least substantially said predetermined distance; the improvement comprising a plurality of base members adapted to be fixed to the horizontal surface to support said posts in spaced-apart relation for receiving the ends of the panels, each of said base members comprising a support block dimensioned to frictionally engage the inside of said posts and having two pairs of opposed side walls, the side walls of each pair gradually diverging outwardly with respect to one another from the top end of said support block toward the bottom end thereof, one pair of said side walls having aligned oppositely-opening channel recesses therein adapted to receive said channels and extending for the lengths thereof, one side wall of the other pair having a channel recess therein adapted to receive said channels and extending for the length thereof, said recesses in said one pair of side Walls being spaced from the other side wall of said other pair by a given distance, said recess in said one side wall of said other pair of side walls being spaced by at least substantially said given distance from one of said side walls of said one pair; whereby one end of each of said posts fits over one of said base members.

5. A base member adapted to be fixed to a surface for uprightly supporting generally square at least substantially equally dimensioned hollow posts having either (a) one outwardly-opening recess definedby an inwardly-extending channel on one side wall thereof and spaced a predetermined distance from one longitudinal edge of the side wall having the channel thereon, (b) two outwardlyopening recesses defined by aligned inwardly-extending channels on opposed side walls thereof and spaced from the longitudinal edges of the side walls having the channels thereon by the predetermined distance, or (c) two outwardly-opening recesses defined by two inwardlyextending channels in adjacent side Walls thereof extending at right angles to one another and spaced from the remote longitudinal edges of the respective side walls having the channels thereon by the predetermined distance; said base member comprising a block dimensioned to frictionally engage the inside of such posts and having two pairs of opposed side walls, the side walls of each pair gradually diverging outwardly with respect to one another from the top end of said block toward the bottom end thereof; one pair of said side walls having aligned oppositely-opening channel recesses therein and extend ing for the lengths thereof, one side wall of the other pair having a channel recess therein extending for the length thereof, said recesses in said one pair of side walls being spaced from the other side wall of said other pair by a given distance, said recess in said one side wall of said other pair of side walls being spaced by at least susbtantially said given distance from one of said side walls of said one pair.

6. A base member for supporting hollow posts as defined in claim 5 having two longitudinal bores therein through which attaching means can pass, and being free of any structure projecting laterally of said side walls 9 10 whereby said base member is wholly concealable within 2,763,342 9/1956 French 189--36 a post. 2,915,151 12/1959 Kebenak 52-495 2,949,984 8/1960 Daniels 52-127 References Cited y the Examiner 2,970,677 2/1961 Springs et a1 52 4s3 5 2,998,110 8/1961 Hutzelman 52-301 FOREIGN PATENTS UNITED STATES PATENTS 16 74 1 2298 1,252,408 52-90 1,202,295 7/ 1959 Fmnce- 097 597 7 1935 Dean 1 9 35 666,611 2/1952 Great 2,059,565 11/1936 Driver 52-463 10 2,079,635 5/1937 Sharp 52 241 RICHARD W. COOKE, JR., Przmary Examiner.

2,664,977 1/1954 Starcevich 52-301 EARL C. DARSCH, Examiner. 

1. IN AN ASSEMBLY FOR VERTICALLY SUPPORTING A PLURALITY OF PANELS WITH RESPECT TO A HORIZONTAL SURFACE, SAID ASSEMBLY COMPRISING A PLURALITY OF GENERALLY SQUARE AT LEAST SUBSTANTIALLY EQUALLY-DIMENSIONED OPEN-ENDED ELONGATED HOLLOW POSTS, AT LEAST ONE OF SAID POSTS HAVING AN OUTWARDLY-OPENING PANEL-RECEIVING LONGITUDINAL RECESS THEREON DEFINED BY AN INWARDLY-EXTENDING CHANNEL ON ONE SIDE WALL THEREOF AND SPACED A PREDETERMINED DISTANCE FROM ONE LONGITUDINAL EDGE OF THE SAID ONE WALL; AT LEAST ONE OF SAID POSTS HAVING TWO OUTWARDLY-OPENING PANEL-RECEIVING LONGITUDINAL RECESSES THEREON DEFINED BY ALIGNED INWARDLY-EXTENDING CHANNELS ON OPPOSED SIDE WALLS THEREOF AND SPACED FROM THE LONGITUDINAL EDGES OF THE SAID OPPOSED SIDE WALLS BY AT LEAST SUBSTANTIALLY SAID PREDETERMINED DISTANCE, AND AT LEAST ONE OF SAID POSTS HAVING TWO OUTWARDLY-OPENING PANEL-RECEIVING LONGITUDINAL RECESSES THEREON DEFINED BY TWO INWARDLY-EXTENDING CHANNELS IN ADJACENT SIDE WALLS THEREOF EXTENDING AT RIGHT ANGLES TO ONE ANOTHER AND SPACED FROM THE REMOTE LONGITUDINAL EDGES OF THE SAID ADJACENT SIDE WALLS BY AT LEAST SUBSTANTIALLY SAID PREDETERMINED DISTANCE; SAID RECESSES ON SAID POSTS EXTENDING INTERMEDIATE SAID LONGITUDINAL EDGES, SAID PREDETERMINED DISTANCE BEING LESS THAN THE DISTANCE BETWEEN SAID CHANNEL AND THE OTHER LONGITUDINAL EDGE OF THE SIDE WALL ON WHICH THE CHANNEL IS DISPOSED; THE IM- 